[Rd] [PATCH] fix CHECK_this_length in sprintf.c

Tue Apr 5 17:17:30 CEST 2016

All~

CHECK_this_length macro expands to multiple statements making it unsafe to
use in a single line `if` statement (as is happening near line 335).  This
fixes the macro using the standard `do { } while (0)` macro trick.

Matt
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